Mate connector not showing up in assembly?

Answers

• NeilCooke Moderator, Onshape Employees Posts: 5,714

  June 2022 Answer ✓

  There is a determinism issue with part IDs when there are lots of splits and booleans. We are investigating how to make it more robust, but for now it is what it is.

  Senior Director, Technical Services, EMEAI

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• S1mon Member Posts: 3,039 PRO

  June 2022

  I had this idea that if the name doesn't get lost during the split/boolean cycle, then the part ID might be fine too, but I guess I was wrong. With the splits used in my part studio, there are two parts with the same name, so I just tried swapping the order in the Boolean Add, and that didn't solve the problem I (there's more than one split, so I would really need to try multiple things to track this down). In this case, moving the MC to the end of the tree is an easy fix, but yes, it would be nice if there was more control/visibility into the part IDs.

  
  

  It's also a little counter-intuitive that the MC shows up in the part but doesn't in the assembly. It seems like the MC should have some sort of indication that it's lost its part, or as you say the part IDs need to be more robust.
  
  Perhaps having split create two parts with the same name is confusing for the user (i.e. me), since it's not clear which one has actually kept the internal ID from prior to the split. If I had a clear indication which one had inherited the ID, I could be more careful about downstream features.

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• Dean_Gardner Member Posts: 107 PRO

  February 2023

  Having the same issue here.  Was this ever resolved?
  
  

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• Dean_Gardner Member Posts: 107 PRO

  February 2023

  It seems that every time i make a split to the body I lose the MC reference to the part. Seems a shame to not resolve this.  Was beginning to like MCs for their robustness... Just seem to be making new MCs and fixing the assembly all the time.

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• Taylor_Nicholson Member Posts: 5 ✭

  August 2023

  Have encountered this issue a few times as well. Quite annoying. Just had this happen again when the split feature only results in one part (split of a single part with a plane and "Keep both sides" unchecked). More understandable when creating multiple parts (still should be fixed), but with "one part in - one part out" this just seems flawed.
  

  
  

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• blefroy_exs Member Posts: 15 ✭

  January 30

  Also having this issue

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• jerry_berns465 Member Posts: 5 EDU

  February 24

  Also having the issue of missing mate connector in assembly.

  
  

  

  
  

  

  
  

  Simple box shape with a polygon (hex) shape extrude cut through the box.

  
  

  Turn on the hex sketch visibility and then added the mate connector at the center.

  
  

  Place the part into an assembly, but the mate connector does not appear.

  
  

  If this is not a bug, can someone explain why the mate connector is not available?

  
  

  Regards,

  Jerry
  

  
  

  3
• martin_kopplow Member Posts: 534 PRO

  February 24

  Saw the same occasionally, thought I was stupid, but at least I'm not alone. This is highly annoying in complex assemblies and very unlogical (even if it could be explained by entity IDs changing after certain operations, but hey, if it can be easily explaned, it could as well be caught!) If a mate connector is linked to a feature (like in above example), the correct owner part could be calculated or forwared even after a split operation or the like has been made.
  

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• eric_pesty Member Posts: 1,947 PRO

  February 24

  jerry_berns465 said:

  Also having the issue of missing mate connector in assembly.

  
  

  

  
  

  

  
  

  Simple box shape with a polygon (hex) shape extrude cut through the box.

  
  

  Turn on the hex sketch visibility and then added the mate connector at the center.

  
  

  Place the part into an assembly, but the mate connector does not appear.

  
  

  If this is not a bug, can someone explain why the mate connector is not available?

  
  

  Regards,

  Jerry
  

  
  

  I think what happened is that the "owner" of the mate connector is the sketch and not the part.. If you used the sketch to define the MC it would define to be owned by the sketch by default (which didn't use to be an option).
  In this example I am not sure why you would need to define an explicit mate connector at the center of the hex when there is an implicit MC right there always available...

  2
• eric_pesty Member Posts: 1,947 PRO

  February 24 edited February 24 Answer ✓

  martin_kopplow said:

  Saw the same occasionally, thought I was stupid, but at least I'm not alone. This is highly annoying in complex assemblies and very unlogical (even if it could be explained by entity IDs changing after certain operations, but hey, if it can be easily explaned, it could as well be caught!) If a mate connector is linked to a feature (like in above example), the correct owner part could be calculated or forwared even after a split operation or the like has been made.
  

  I agree the split tool should have a section for managing any MC with the option to pick which of the half should keep the MC (and default to the remaining part if keep both sides is unchecked), and an option to "replicate" the MC to both parts.

  1
• martin_kopplow Member Posts: 534 PRO

  February 24 edited February 24

  If there was an implicit mate, it'd make no sense, of course, but I suppose the above just an example. Yes, in the above sample, it could be because the owner was a sketch. I'll try to keep a eye open for that. There are reasons to put explicit mate connectors on parts, though, for example as a mark for later arrangements in the assembly, and because implicit mates tend to be compromised by features such as fillets or drafts. Since these mates would be potentionally important for downstream work, they should be permanent, and it is crucial to understand why and when they might disappear and how to avoid.
  

  Them just disapperaing without a notice is a probably the worst option.
  

  1
• GWS50 Member Posts: 422 PRO

  February 25 edited February 25

  Same problem here. Actually just worked out that the mate connectors were attached to the origin which was hidden

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• jerry_berns465 Member Posts: 5 EDU

  February 26

  The reason I made the MC at the part studio was because it was nearly impossible to use the implied MC while in the assembly. I could hover over the edge of the hex hole, but could not find any way to snap to the center of the hex hole. Only after tilting the model so that the hex was nearly seen from on edge could the center be selected.

  If there is a better way to select the center of a hex hole, I would really appreciate seeing a video.

  Maybe if OS had some kind of snap cycling it would be easier.
  

  1
• glen_dewsbury Member Posts: 822 ✭✭✭✭

  February 26

  jerry_berns465 said:

  The reason I made the MC at the part studio was because it was nearly impossible to use the implied MC while in the assembly. I could hover over the edge of the hex hole, but could not find any way to snap to the center of the hex hole. Only after tilting the model so that the hex was nearly seen from on edge could the center be selected.

  If there is a better way to select the center of a hex hole, I would really appreciate seeing a video.

  Maybe if OS had some kind of snap cycling it would be easier.
  

  From the assembly. While you're selecting an implicit mate connecter, Hover over the face of the block and press/hold shift key. This will keep selection on face and allow to slide over the hex hole and select center.

  2
• jerry_berns465 Member Posts: 5 EDU

  February 27

  @glen_dewsbury,

  
  

  Thank you, Glen! I thought I tried the SHIFT press/hold method, but it certainly worked tonight when I tried it.

  I will be certain to share this with the students. Thanks again!

  
  

  Regards,

  Jerry
  

  0
• Rob_Ku Member Posts: 2 ✭✭

  July 20

  eric_pesty said:

  jerry_berns465 said:

  Also having the issue of missing mate connector in assembly.

  
  

  

  
  

  

  
  

  Simple box shape with a polygon (hex) shape extrude cut through the box.

  
  

  Turn on the hex sketch visibility and then added the mate connector at the center.

  
  

  Place the part into an assembly, but the mate connector does not appear.

  
  

  If this is not a bug, can someone explain why the mate connector is not available?

  
  

  Regards,

  Jerry
  

  
  

  I think what happened is that the "owner" of the mate connector is the sketch and not the part.. If you used the sketch to define the MC it would define to be owned by the sketch by default (which didn't use to be an option).
  In this example I am not sure why you would need to define an explicit mate connector at the center of the hex when there is an implicit MC right there always available...

  
  This toally solved the problem for me. As soon as I changed the owner in the mate connector feature to the part, it showed up in the assembly.
  THANKS!!!

  1
• Lachlan_G99 Member Posts: 1 PRO

  August 1

  I had this issue as well. Defined a MC in part studio by a sketch because the MC wouldn't automatically locate where i needed it to be. The MC, then couldn't be seen n the Assembly. I then discovered the option "select owner identity" in the part studio MC creation area, and saw that the owner identity was the sketch point, so I then selected the part instead of the sketch point. Now the MC is visible in the Assembly. 

  2